- Problem with Monte Carlo bidirection path tracing:
Need lots of ray (Very expensive, Noisy results)

- Metropolis Light Transport Algorithm reduces the cost
- Idea: Take one path from light to eye
Perturb this

*path*and see if it still reaches the eye.\

- Low error, low noise
- New, untested

CS488/688: Introduction to Interactive Computer Graphics

University of Waterloo

Computer Graphics Lab